Self-tightening propeller-hub



I 0(A. DICKEY. SELF TIGHTENING PROPELLE R HUB.

APPLICATION FILED IAN-K1919.

Patented D00. 13, 1921.

8 1 will: I

4|NVENTOR Dan/kl A Dickey. 7 BY ATTORNEY- WITNESSES UNWE S ATS DANIEL ADAM DICKEY, or WiLKINsBuas, PENNSYLVANIA, assie roit Iro w'sseim HOUSE ELECTRIC & IvIANUFACTUItII TG COMPANY, a coaroaarrou 0E PENNSYLT VANIA.

IAQGABZ.

To an whom it mag concern:

Beit known that I, D-NIEL dent of lVilkinsburg, in the county of- Alle gheny and State of Pennsylvania, have' .-in f vented a new and useful Improvement in plied to a propeller and from which a propeller may be quickly and easily removed.

Another object of my invention resides in constructing a propeller in such manner that there shall be no necessity for passing bolts or equivalent fastening devices through the hub portion of the propeller, with consequent weakening of the propeller hub.

With these and other objects in view, my invention will be more fully described, illustrated in the drawings, in the several views of which corresponding numerals indicate like parts, and. then particularly pointed out in the claims.

In the drawings, Figure 1 is an elevation of my improved hub, and Fig.2 is a diametral sectional view taken through thehub and through the hub portion of a propeller mounted thereon.

In practising my invention, I may provide a metal hub in the form of a sleeve or bushing adapted to be keyed upon a propeller-shaft and I may further provide members cooperating with this sleeve or bushing in such manner as to automatically clamp a propeller mounted between them and upon the bushing.

Referring more particularly to the draw ings, which disclose one form of my invention, my hub comprisesa cylindrical body 1, of any suitable metal, formed with an axial, tapered, propeller-shaft-receiving bore 2 which may be provided with one or more keyways 3. The hub body or bushing has Application filed January 16, 1 919 Serial; No. 271,538

A. DroKnY, a citizen of the United States, and a, resr snnr-r enrnunve rJaOrELLER-H B.

Specification of LettersPatent. -Pat nt ed Dec, 13, 1{921 itsfend portions e xter'iorly and: reversely threaded, as shown at 4;, to receive clamping nuts The clamping'nuts 5fare preferably; provided with annular compression flanges 6 adaptedto engage against the faces ofapropeller hub-'7, in the manner shown in Fig. 2. l v

When a propeller is mounted upon the 'hub body, as shown in the drawings, and

the clamping nuts 5 are tightened against the hub faces, any tendency for the-propeller to turn about the hub is prevented, as the frictional engagement between the nuts and the faces of the propeller-hub will act to cause the nuts to turn toward each other the propeller-hub.

While, in most instances, it is not necessary, I may provide the propeller-hub-engaging faces of the nut flanges with rough? ened surfaces 8, by corrugating, knurling and into firm clamping engagement with or ribbing them, to increase the frictional engagement and thus to further insure turning of the nuts with the propeller until they are so tightened a to securely lock the propeller to the hub. I Pins or smallscrews 9 may-also be passed through the compression'fianges of the nuts 5 into the propellerhub 7 if deemed advisable.

From the foregoing description, it will be apparent that I have provided a propellerhub which is strongand, at the same time, light in construction. It will further be obvious that the hub will tighten automatically to firmly hold the propeller against any movement about it and against longitu dinal displacement. A hub constructed in the manner shown may be'quickly applied to a propeller, and a damaged propeller may be quickly and easily removed from the hub without necessitating removal'of the hub from the propeller shaft, it being necessary merely to remove the front clamping nut in order to release the propeller.

While the hub is primarily intended for use with composite propellers formed, by molding superimposed layers, of fibrous sheet material, impregnated with a suitable binder, such as a phenolic condensation product, it will be appreciated that it may be employed with propellers of, other materials. In adaptingthe hub to propellers of other materials, certain modifications may be advisable and it will, therefore, be understood that no limitations are to be imposed u on my invention, other than those indicate in the appended claims.

I claim as my invention 1, Ahub for ropellers and the like coinprisi'ng-a' cylindrical body formed with a shaft-receiving bore and having its ends exteriorly and reverselythreaded, and clamping nuts applicable to the reversely threaded ends of the body.

2. A hub for propellersand the-like coni r prising a cylindrical body formed with a shaft-receiving bore and with reversely threaded end portions, and clamping ele-' ments having threaded engagement. thereon; '3. A hub for propellers and the like comprising a cylindrical body formed with a shaft-receiving bore and with reversely 'threaded'endportions, and flanged clamping element having threaded engagement with the end portions, the opposed faces of the flanged nuts being roughened.

5.A"hubcoinpr1sing a tubular body having reversely threaded end portions-and clamping elements having threaded engagement thereon.

- In testimony whereof, have hereunto subscribed my name this 27th day of Dec;

- DANIEL ADAM DIOKEY. V 

